Logger And Method For Attaching Logger

The present application is based on, and claims priority from JP Application Serial Number 2024-203578, filed Nov. 22, 2024, the disclosure of which is hereby incorporated by reference herein in its entirety.

The present disclosure relates to a logger, and a method for attaching a logger.

JP-A-2000-283938 discloses a dewpoint sensor that, when exposed to a flow between the entry port and the exit port of a pressure vessel, calculates a dewpoint value of that flow. A quartz crystal resonator is housed within the pressure vessel, a circuit controls the temperature of the quartz crystal resonator, and a temperature sensor generates signals representing the temperature of the quartz crystal resonator. The circuit monitors the temperature signals and the frequency of the quartz crystal resonator and calculates the dewpoint value.

The dewpoint sensor disclosed in JP-A-2000-283938 is very large in scale and difficult to miniaturize. This dewpoint sensor is intended to calculate a dewpoint value and is not a logger for recording times and measured values in association with each other.

An aspect of the present disclosure relates to a logger including a clock circuit configured to generate time information; a first electrode; a second electrode to which a reference voltage is supplied; an event detection circuit configured to detect an event based on a voltage change of an input signal input from the first electrode; a storage circuit; and a processing circuit configured to determine, in response to detection of the event by the event detection circuit, a change in a resistance value of the measurement object disposed between the first electrode and the second electrode due to wetting of the measurement object by a liquid, and to record, in the storage circuit as log information, the time information indicating detection of the event.

Another aspect of the present disclosure relates to a method for attaching a logger to a measurement object, the logger including: a clock circuit configured to generate time information, a first electrode, a second electrode to which a reference voltage is supplied, an event detection circuit configured to detect an event based on an input signal input from the first electrode, a storage circuit, and a processing circuit configured to record the time information in the storage circuit when the event detection circuit detects the event, the method comprising: attaching the logger to the measurement object such that the first electrode and the second electrode of the logger are in contact with the measurement object.

An embodiment of the present disclosure will now be described in detail. The present embodiment described below does not unduly limit the scope of the appended claims, and not all the configurations described in the present embodiment are necessarily essential constituent elements.

1 FIG. 40 40 600 41 42 600 120 170 150 130 is a block diagram illustrating a configuration example of a loggeraccording to the present embodiment. The loggerincludes a real-time clock device, a first electrode, and a second electrode. The real-time clock deviceincludes a clock circuit, an event detection circuit, a storage circuit, and a processing circuit.

600 40 40 120 170 150 130 Hereafter, an example will be described in which the real-time clock deviceis used as the sensor module of the logger. That is, in this example, the event timestamp function of a real-time clock (RTC) is used as a log recording function. However, the sensor module of the loggeris not limited thereto, and may be any sensor module as long as it includes the clock circuit, the event detection circuit, the storage circuit, and the processing circuitdescribed below.

40 5 41 42 5 5 5 40 5 41 42 5 5 56 41 42 5 40 5 5 45 46 46 41 42 5 a a 4 FIG. 9 FIG. 4 FIG. 11 FIG. 12 FIG. When the loggeris used, it is attached to a measurement object. At this time, the first electrodeand the second electrodeare in contact with the measurement object. An example of the measurement objectin this case is corrugated fiberboarddescribed with reference to. Alternatively, the loggermay include the measurement objectin advance, with the first electrodeand the second electrodein contact with the measurement object. An example of the measurement objectin this case is a piece of paperdescribed with reference to. Alternatively, the first electrodeand the second electrodemay be disposed on the measurement object, and the loggermay include the measurement object. Examples of the measurement objectin this case are a substratein, a substratein, or the substratein. The first and second electrodesandmay also be used while exposed to the air instead of being in contact with the corrugated fiberboardor the like.

5 41 42 5 5 5 5 The measurement objectis not limited to the above examples, and may be any substance as long as the resistance value between the first electrodeand the second electrodechanges when the substance is wetted by a liquid. For example, the measurement objectis wetted when a liquid soaks into it, when it absorbs a liquid, or when a liquid adheres to its surface. The measurement objectmay be any substance, and is, for example, paper, wood, resin, insulating coated metal, ceramic, or glass. The liquid may be any liquid as long as it can change the resistance value of the measurement object, and is, for example, water. Examples of situations in which the measurement objectis wetted by a liquid include condensation of moisture in the air, wetting by rain, submersion in water, and liquid leakage from a container or the like. Although wetting due to condensation will be described hereafter as an example, “condensation” may be replaced with various wetting situations as mentioned above.

42 600 40 600 A reference voltage VRF is supplied to the second electrode. The reference voltage VRF may be any constant voltage, for example, a power supply voltage or a ground voltage of the real-time clock device. For example, the loggermay include a power supply such as a battery, and a power supply voltage or a ground voltage generated by the power supply may be used as the reference voltage VRF. The power supply may be disposed inside or outside the real-time clock device.

41 42 5 170 41 5 5 The first electrodeis connected to the second electrodeof the reference voltage VRF through a resistance caused by the measurement object. The event detection circuitmonitors an input signal EVI from the first electrodeto detect the resistance value of the measurement object, that is, the state of condensation, as an event. The state of condensation may be represented by a binary value indicating whether condensation is present or absent, or may be represented by multiple values indicating the degree of condensation in multiple stages. The state in which there is no condensation may include not only a state in which condensation has never occurred but also a dry state after condensation. Hereafter, a technique using resistance voltage division will be described as an example of a technique that changes the input signal EVI in accordance with the resistance value of the measurement object.

41 41 170 600 41 5 170 The first electrodeis pulled up or down to a voltage different from the reference voltage VRF. For example, when the reference voltage VRF is the ground voltage, the first electrodeis pulled up to the power supply voltage. A pull-up resistor or a pull-down resistor may be built into the event detection circuitor may be provided outside the real-time clock device. The voltage of the input signal EVI changes in accordance with the resistance ratio between the resistance of the pull-up or pull-down resistor connected to the first electrodeand the resistance of the measurement object. The event detection circuitdetects a condensation event based on this voltage change.

120 The clock circuitgenerates time information TMD indicating the current point in time. An example of the time information TMD is so-called calendar data. The calendar data represents some or all of the following: year, month, day, hour, minute, and second.

170 130 120 150 40 5 40 When a condensation event is detected by the event detection circuit, the processing circuitacquires the time information TMD from the clock circuit, and records log information of condensation in the storage circuitbased on the time information TMD. The log information is information in which the occurrence of a condensation event is associated with the time information TMD at which the event has occurred. As described above, the loggercan record log information of condensation by monitoring a resistance value change of the measurement objectcaused by condensation. This enables the loggerto achieve, for example, a simple configuration for miniaturization, low power consumption, and low cost.

1 FIG. 41 600 600 41 42 41 42 600 600 40 Althoughillustrates an example in which the first electrodeis disposed separately from the real-time clock device, a terminal of the real-time clock devicemay be used as the first electrode, as described later. The same applies to the second electrode. When the first electrodeand the second electrodeare the terminals of the real-time clock device, the real-time clock deviceitself functions as the logger.

2 FIG. 40 42 41 illustrates operation of the logger. Illustrated here is an example in which the ground voltage is supplied to the second electrode, the first electrodeis pulled up to the power supply voltage, and the presence or absence of condensation is detected.

600 5 5 41 42 At time ta, the real-time clock deviceis activated and initialized. The initialization includes initial setting of the time information TMD, operation setting of the timestamp, and so forth. At time ta, it is assumed that no condensation has occurred and the measurement objectis not wet. Since the measurement objectbetween the first electrodeand the second electrodehas a high resistance, the input signal EVI is pulled up close to the power supply voltage.

5 5 41 42 42 170 5 41 42 2 FIG. At time tb, it is assumed that condensation has occurred and the measurement objectis wetted. The resistance of the measurement objectbetween the first electrodeand the second electrodedecreases, and therefore the input signal EVI is close to the ground voltage due to the ground voltage of the second electrode. The event detection circuitcompares the voltage of the input signal EVI with the threshold voltage Vth to generate an event detection signal SEV. The threshold voltage Vth is a constant voltage between the power supply voltage and the ground voltage. Assuming that a resistance corresponding to the threshold voltage Vth is a threshold Rth, the above comparison may be rephrased as a comparison of the resistance of the measurement objectbetween the first electrodeand the second electrodewith the resistance threshold Rth. The event detection signal SEV is at a first logic level when the input signal EVI is equal to or higher than the threshold voltage Vth, and is at a second logic level when the input signal EVI is lower than the threshold voltage Vth.illustrates an example in which the first logic level is a high level and the second logic level is a low level. At time tb, the event detection signal SEV changes from the high level to the low level.

5 5 41 42 When the condensation stops, the measurement objectbecomes dry. It is assumed that, at time tc, the resistance of the measurement objectbetween the first electrodeand the second electrodeis equal to or higher than the threshold Rth. At time tc, the input signal EVI becomes equal to or higher than the threshold voltage Vth, and therefore the event detection signal SEV changes from the low level to the high level.

170 170 170 2 FIG. In accordance with the event detection signal SEV, the event detection circuitoutputs an event trigger signal EVTRG for triggering timestamp recording at the time of event occurrence. Specifically, the event detection circuitgenerates a pulse of the event trigger signal EVTRG at the timing when the logic level of the event detection signal SEV changes. In the example of, the event detection circuitgenerates a pulse of the event trigger signal EVTRG at both time tb and time tc.

130 150 130 2 FIG. The processing circuitrecords, as condensation log information, the event detection signal SEV and the time information TMD when a pulse of the event trigger signal EVTRG is generated in the storage circuit. The logic level of the recorded event detection signal SEV indicates whether condensation has occurred or has dried at that time. In the example of, the processing circuitrecords, at time tb, the event detection signal SEV at the low level associated with the time information TMD of time tb, and, at time tc, the event detection signal SEV at the high level in association with the time information TMD of time tc.

3 FIG. 600 is an external perspective view of the real-time clock device. The three mutually perpendicular directions are referred to as the x-direction, y-direction, and z-direction. The z-direction may also be referred to as the vertical direction.

600 500 500 120 170 150 130 500 500 500 500 500 500 500 1 FIG. 3 FIG. The real-time clock deviceincludes a package, and has a structure in which a vibrator and an integrated circuit device are housed inside the package. The integrated circuit device includes the clock circuit, the event detection circuit, the storage circuit, and the processing circuitdescribed with reference to. The packagehas a substantially rectangular parallelepiped shape, with its sides aligned along the x-, y-, and z-axes. A plurality of terminals TM for connecting the integrated circuit device housed in the packageto the outside of the packageare disposed on the bottom surface side of the package.illustrates each terminal TM as having a shape that extends from the side surface to the bottom surface of the package; however, the shape of the terminal TM is not limited to this configuration. For example, the terminals TM may be bump terminals disposed on the bottom surface of the package, or lead terminals extending outward from the outer periphery of the bottom surface of the package.

500 500 600 500 500 600 3 FIG. The packagemay be, for example, a ceramic package of the type used in oscillators with quartz crystal vibrators, sensors, or similar devices. Such a ceramic package may be regarded as a single component mounted on a printed circuit board or other substrate, and is much smaller than a typical electronic device in which multiple components are combined and housed together in a housing. For instance, the longest side of the packagehas a length WD of 20 mm or less. Althoughillustrates an example in which the x-direction side is the longest, the longest side may instead lie in the y- or z-direction. Accordingly, the real-time clock deviceincluding the small-sized packageenables the implementation of a condensation logger that is significantly smaller than a large-scale dewpoint sensor disclosed in JP-A-2000-283938. The packageis not limited to a ceramic package and may instead be formed from other materials, such as resin. Additionally, although the real-time clock deviceincludes the terminals TM, it does not necessarily have to be mounted on a substrate, provided that power is supplied.

4 FIG. 3 FIG. 40 600 40 600 50 45 40 illustrates a first structural example of the loggerusing the real-time clock deviceillustrated in. The loggerincludes the real-time clock device, a battery, and a substrate. Various examples of the structure of the loggerare conceivable and will be described later.

45 45 1 2 600 50 45 50 41 42 45 600 170 41 1 1 50 42 2 2 50 3 50 600 The substratemay be a rigid substrate such as a printed circuit board (PCB) or a ceramic substrate, or may be a flexible substrate. The substratehas a hole HLand a hole HLextending through it between its first and second surfaces. The real-time clock deviceand the batteryare mounted on the first surface of the substrate. The batterymay be a small-sized battery such as a button battery. The first electrodeand the second electrodeare disposed on the second surface of the substrate. The real-time clock deviceincludes a power supply terminal, a ground terminal, and an event input terminal as the terminals TM. The event input terminal is connected to the event detection circuit. The event input terminal and the first electrodeare connected by a wire LNvia the hole HL. The ground terminal, the negative terminal of the battery, and the second electrodeare connected by a wire LNvia the hole HL. The power supply terminal and the positive terminal of the batteryare connected by a wire LN. The batterymay also be built into the real-time clock device.

4 FIG. 5 5 5 40 40 5 45 45 5 41 42 5 5 600 5 5 a a a a a a a As illustrated in the side view of, corrugated fiberboardis assumed as the measurement object. The corrugated fiberboardconstitutes a corrugated fiberboard box for packaging an article during transportation. When the loggeris used, the loggeris attached to the corrugated fiberboardsuch that the second surface of the substrateis in contact with the inner wall surface of the corrugated fiberboard box. The second surface of the substrateis attached to the corrugated fiberboardwith adhesive tape, an adhesive, or other means, so that the first electrodeand the second electrodeare in contact with the corrugated fiberboard. When the corrugated fiberboardis wetted by condensation, the real-time clock devicerecords the condensation event. The measurement objectis not limited to the corrugated fiberboardand may be various objects as described above.

40 40 40 40 Although the loggercan be used for various purposes of detecting wetting by liquid, an exemplary usage of the loggeris physical distribution. In this case, the loggeris installed in or near an item to be transported, and is used to detect and record condensation during a physical distribution process. As used herein, the term “physical distribution process” includes not only transportation but also packaging and unpacking before and after transportation, as well as installation of the transported article. Additionally, the loggermay be used during one or more of packaging, transportation, unpacking, and installation.

40 40 40 40 40 4 FIG. Various attachment positions of the loggerin physical distribution are conceivable. For example, as described with reference to, the loggermay be attached to the inner wall of a corrugated fiberboard box as a packaging material. Alternatively, the loggermay be attached to the surface of an item to be packaged. Alternatively, the loggermay be incorporated in advance inside an item to be transported, such as being mounted on a substrate of an electronic device to be transported. Alternatively, the loggermay be attached inside the cargo compartment of a motor vehicle, train, ship, or aircraft used for transporting an item, or inside a container that stores the item during transportation.

40 Use of the loggerin physical distribution makes it possible to determine when condensation has occurred during the physical distribution process or when the condensation has dried. By comparing such log information with information indicating when each stage of the distribution is performed, it is possible to estimate at which stage the condensation event occurred. This enables investigation, assurance, certification or the like of transport quality.

40 40 For example, in recent years, paper has been increasingly used as a packaging material for environmental considerations. Paper is a useful alternative to resin as a packaging material; however, it has a disadvantage in that when wetted by condensation, its strength decreases, reducing its protective ability. Therefore, packaging design needs to include a margin against strength reduction caused by condensation, which may lead to increased transportation costs. The loggerof the present embodiment is small and inexpensive, and can therefore be readily used for transporting various items. This may guarantee the transport quality while reducing the amount of packaging material, resulting in lower transport costs. Additionally, transport quality can be assured by investigating the transport route using the loggerand improving the transport quality, which can also reduce packaging material use.

40 40 In addition, during physical distribution, condensation may occur not only on packaging materials but also on the items themselves. For example, it is assumed that items are contained in a corrugated fiberboard box. At night, the corrugated fiberboard box and the items cool down, and then during the day, the corrugated fiberboard box is warmed from the outside. In this process, the items remain cool while the surrounding air becomes warm, causing condensation on the items and wetting them. The loggerof the present embodiment is capable of recording the presence or absence of such condensation on items. For example, when an item vulnerable to moisture, such as an electronic device, is transported, the loggermay record the presence or absence of condensation to demonstrate that no condensation has occurred.

40 120 41 42 170 1 41 150 130 130 170 5 41 42 5 150 In the present embodiment, the loggerincludes the clock circuitconfigured to generate the time information TMD; the first electrode; the second electrodeto which the reference voltage VRF is supplied; the event detection circuitconfigured to detect an event based on a voltage change of the input signal EVinput from the first electrode; the storage circuit; and the processing circuit. The processing circuitis configured to determine, in response to detection of the event by the event detection circuit, a change in a resistance value of the measurement objectbetween the first electrodeand the second electrodedue to wetting of the measurement objectby a liquid, and to record, in the storage circuitas log information LGD, the time information TMD indicating detection of the event.

40 5 5 40 40 According to the present embodiment, the loggercan monitor that the resistance value of the measurement objecthas changed due to wetting of the measurement objectby a liquid, and can detect a wetting event using the change in the resistance value and record log information of the wetting event. This enables detection of a liquid wetting state, rather than dew-point detection as described in JP-A-2000-283938. In addition, by using event detection based on a change in resistance value, the loggerhaving a simple configuration is implemented. For example, miniaturization, low power consumption, and low cost of the loggerare achieved.

41 42 5 5 Additionally, in the present embodiment, the first electrodeand the second electrodeare used in contact with the measurement object, or are disposed for the measurement object.

5 41 42 41 42 170 According to the present embodiment, when the measurement objectbetween the first electrodeand the second electrodeis wetted by a liquid, the resistance value between the first electrodeand the second electrodechanges. The event detection circuitcan detect an event based on a change in the voltage of the input signal EVI caused by the change in the resistance value.

170 41 41 Additionally, in the present embodiment, the event detection circuitincludes a pull-up resistor for pulling up the first electrodeor a pull-down resistor for pulling down the first electrode.

5 5 170 According to the present embodiment, the voltage of the input signal EVI is determined by the resistance ratio between the resistance value of the pull-up resistor or the pull-down resistor and the resistance value of the measurement object. When the measurement objectis wetted and the resistance value changes, the resistance ratio changes, thereby changing the voltage of the input signal EVI. The event detection circuitcan detect an event based on the voltage change of the input signal EVI.

40 600 500 500 120 170 150 130 Additionally, in the present embodiment, the loggerincludes a real-time clock devicehaving the package. The packagehouses the clock circuit, the event detection circuit, the storage circuit, and the processing circuit.

40 600 600 According to the present embodiment, the loggeris configured using the real-time clock device, enabling recording of a wetting event to be implemented using the timestamp function of the real-time clock device.

40 45 41 42 41 600 42 600 Additionally, in the present embodiment, the loggerincludes the substrateon which the first electrodeand the second electrodeare disposed. The first electrodeis connected to an event input terminal of the real-time clock device. The second electrodeis connected to a terminal of the reference voltage VRF of the real-time clock device. The terminal of the reference voltage VRF is, for example, a power supply terminal or a ground terminal, but may be a terminal of an arbitrary constant voltage.

45 5 45 5 5 41 600 600 According to the present embodiment, additionally, attaching the substrateto the measurement objector using the substrateas the measurement objectenables an event to be detected based on the resistance value of the measurement object. Additionally, according to the present embodiment, the input signal EVI from the first electrodeis input to the event input terminal of the real-time clock device. Accordingly, a wetting event is recorded by the timestamp function of the real-time clock device.

600 45 41 42 45 Additionally, in the present embodiment, the real-time clock deviceis disposed on the first surface of the substrate. The first electrodeand the second electrodeare disposed on the second surface of the substrate.

5 600 5 600 According to the present embodiment, since the second surface is in contact with the measurement object, the first surface on which the real-time clock deviceis disposed is not in contact with the measurement objectthat is likely to be wetted. This enables the real-time clock deviceto be protected away from a liquid.

5 Additionally, in the present embodiment, the measurement objectmay be paper.

When paper comes into contact with a liquid, it absorbs the liquid. Dry paper and wet paper have different resistances, and therefore use of such a difference enables detection of an event where paper is wetted by a liquid (hereafter referred to as a “liquid wetting event”). Additionally, paper is a material that is easily available or widely used in transportation and the like. Therefore, a highly convenient logger can be implemented by using paper.

5 Additionally, in the present embodiment, the measurement objectmay be a packaging material.

40 40 According to the present embodiment, the loggercan record whether or not the packaging material is wetted by a liquid during the physical distribution process. Additionally, if the packaging material is wetted, the wetting time or the drying time can be recorded by the logger. This enables investigation, guarantee, certification or the like of the transport quality, enabling, for example, improvement in packaging design.

5 Additionally, in the present embodiment, the measurement objectmay be the surface of a transported item.

40 40 According to the present embodiment, the loggercan record whether or not the surface of a transported item is wetted by a liquid during the physical distribution process. Additionally, if the surface is wetted, the wetting time or the drying time can be recorded by the logger. For example, there is a possibility that a transported item is wetted due to condensation or liquid leakage, although liquid wetting of the transported item is desired to be avoided. According to the present embodiment, it is possible to record whether such a transported object has not been wetted.

40 5 40 120 41 42 170 41 150 130 170 130 150 40 5 41 42 40 5 Additionally, the present embodiment may be implemented as a method for attaching the loggerto the measurement object. The loggerincludes the clock circuitthat generates the time information TMD, the first electrode, the second electrodeto which the reference voltage VRF is supplied, the event detection circuitthat detects an event based on the input signal EVI input from the first electrode, the storage circuit, and the processing circuit. When the event detection circuitdetects an event, the processing circuitrecords the time information TMD in the storage circuit. At this time, the attaching method is a method for attaching the loggerto the measurement objectsuch that the first electrodeand the second electrodeof the loggerare in contact with the measurement object.

5 FIG. 3 FIG. 600 500 600 100 300 1 3 1 3 is a block diagram illustrating a first circuit configuration example of the real-time clock device. The packageis omitted in the illustration. The real-time clock deviceincludes an integrated circuit device, a vibrator, interface terminals TMIF, and event input terminals TMEVIto TMEVI. The interface terminals TMIF and the event input terminals TMEVIto TMEVIcorrespond to the terminals TM in.

300 300 300 300 300 The vibratoris an element that generates mechanical vibrations in response to an electrical signal. The vibratormay be implemented by a vibrator element such as a quartz crystal vibrator element. The vibratoris, for example, a tuning fork type quartz crystal vibrator element. Alternatively, the vibratormay be a quartz crystal vibrator element with a cut angle such as AT cut or SC cut, and performs thickness shear vibration. Other possibilities include vibrator elements of types other than the tuning-fork and thickness shear vibration types, and piezoelectric vibrator elements formed from materials other than quartz crystal. For example, the vibratormay be a SAW resonator or a MEMS vibrator, which is a silicon vibrator formed using a silicon substrate. SAW stands for Surface Acoustic Wave, and MEMS stands for Micro Electro Mechanical Systems.

100 110 120 130 150 160 170 100 The integrated circuit deviceincludes an oscillation circuit, a clock circuit, a processing circuit, a storage circuit, an interface circuit, and an event detection circuit. For example, the integrated circuit deviceis a semiconductor substrate in which a plurality of circuit elements are integrated.

110 300 300 110 The oscillation circuitdrives the vibratorto cause the vibratorto oscillate, and generates a clock signal CK based on the oscillating signal. A non-limiting example of the oscillation circuitis a Colpitts oscillator.

120 120 The clock circuitis a circuit that provides a clock function and generates time information TMD indicating the current time by counting based on the clock signal CK. The clock circuitincludes, for example, a frequency divider circuit that divides the frequency of the clock signal CK and a time counter that tracks the current time using the divided signal. The time information TMD may be, for example, the data of a count value from the time counter, or the calendar data described above.

1 3 41 170 1 1 2 2 3 3 170 1 3 1 FIG. Any of the event input terminals TMEVIto TMEVIis connected to the first electrodesillustrated inand other figures. The event detection circuitoutputs an event trigger signal EVTRG based on an input signal EVIfrom the event input node TMEVI, an input signal EVIfrom the event input node TMEVI, and an input signal EVIfrom the event input node TMEVI. Specifically, the event detection circuitgenerates an event detection signal from each of the input signals EVIto EVI, and outputs a pulse of the event trigger signal EVTRG when the logic level of any one of the three event detection signals transitions.

130 150 1 3 130 120 110 150 160 170 130 120 When the pulse of the event trigger signal EVTRG is input, the processing circuitassociates the event occurrence information with the time information TMD and records the resulting information as the log information LGD in the storage circuit. The event occurrence information may be information of only the event detection signal whose logic level has transitioned, or may be information of all the event detection signals SEVto SEV. The processing circuitmay include a control circuit. The control circuit may control some or all of the clock circuit, the oscillation circuit, the storage circuit, the interface circuit, and the event detection circuit. Control-related arrow lines are not illustrated in the drawings. The processing circuitand the clock circuitare logic circuits, and some or all of them may be implemented as an integrated logic circuit using automated place-and-route or the like.

150 130 150 The storage circuitstores the log information LGD output from the processing circuit. The storage circuitis a semiconductor memory and is a RAM or a nonvolatile memory. The RAM is, for example, SRAM or DRAM. SRAM stands for Static Random Access Memory, and DRAM stands for Dynamic Random Access Memory. The nonvolatile memory may be an electrically writable ROM, such as EEPROM. EEPROM stands for Electrically Erasable Programmable Read-Only Memory.

160 600 160 150 160 150 160 130 150 160 160 The interface circuitcommunicates with the outside of the real-time clock devicevia the interface terminals TMIF. The interface circuitoutputs the log information LGD stored in the storage circuitto the outside. For example, in response to a read instruction from the outside, the interface circuitreads the log information LGD from the storage circuitand outputs it to the outside. Alternatively, the interface circuitmay output the log information LGD directly from the processing circuitto the outside, without passing the log information LGD through the storage circuit. The interface circuitmay be an inter-circuit communication interface circuit that complies with any one of various standards. For example, the interface circuitis a serial communication interface circuit in a Serial Peripheral Interface (SPI) mode or an Inter-Integrated Circuit (I2C) mode. SPI stands for Serial Peripheral Interface, and I2C stands for Inter-Integrated Circuit.

6 FIG. 170 170 171 175 176 is a block diagram illustrating a detailed configuration example of the event detection circuit. The event detection circuitincludes a pull-up/down circuit, a noise filter, and an event trigger circuit.

171 1 3 172 1 3 172 1 3 1 3 172 1 3 1 3 172 172 5 600 171 The pull-up/down circuitincludes a pull-down resistor RD, pull-up resistors RUto RU, and a switch circuit. One end of the pull-down resistor RD is connected to a ground voltage node GND. One end of each of the pull-up resistors RUto RUis connected to a power supply voltage node VDD. The switch circuitcommonly connects the event input terminals TMEVIto TMEVIto the other end of any one of the pull-down resistor RD and the pull-up resistors RUto RU. Alternatively, the switch circuitmay independently connect each of the event input terminals TMEVIto TMEVIto the other end of any one of the pull-down resistor RD and the pull-up resistors RUto RU. The switch circuitis, for example, an analog switch using a MOS transistor. The connection state of the switch circuitmay be set, for example, by register setting or the like. The resistance values of the pull-down and pull-up resistors may be selected as appropriate with respect to resistance value changes of the measurement objectcaused by condensation. The number of pull-down resistors may be one or more, and the number of pull-up resistors may also be one or more. Additionally, the pull-up or the pull-down resistor may be disposed outside the real-time clock device. In such a case, the pull-up/down circuitmay be omitted.

175 1 1 175 1 175 175 1 175 2 3 2 3 The noise filtercompares the input signal EVIwith a threshold voltage, performs binarization and filtering, and outputs the result as the event detection signal SEV. Specifically, the noise filterbinarizes the input signal EVIinto a low or high level using a comparator, a buffer circuit, or the like. The noise filtersamples the binarized signal, and when the same logic level continues for a predetermined number of sampling times, the noise filteroutputs the event detection signal SEVat that logic level. Similarly, the noise filtercompares the input signals EVIand EVIwith the threshold voltage, performs binarization and filtering, and outputs the results as event detection signals SEVand SEV.

1 3 176 176 1 1 600 176 1 600 176 When the logic level of any of the event detection signals SEVto SEVtransitions, the event trigger circuitoutputs a pulse of the event trigger signal EVTRG. The event trigger circuitmay further output a pulse of the event trigger signal EVTRG when an event is detected based on other event inputs SAto SAn, where, n is an integer of 1 or more. The other event inputs SAto SAn may include, for example, a signal indicating an operating state of the real-time clock device. The event trigger circuitmay output a pulse of the event trigger signal EVTRG when the signal indicating the operating state changes or becomes a specific signal. Alternatively, the other event inputs SAto SAn may be commands input to the real-time clock devicefrom an external SoC or the like. In that case, the event trigger circuitmay output a pulse of the event trigger signal EVTRG when an arbitrary or specific command is input.

7 FIG. 130 130 132 133 is a block diagram illustrating a detailed configuration example of the processing circuit. The processing circuitincludes a data capture circuitand a buffer control circuit.

132 1 3 1 1 41 1 When a pulse of the event trigger signal EVTRG is input, the data-capture circuitoutputs the event information and the time information TMD in association with each other as the log information LGD. The event information includes the event detection signals SEVto SEV. The event information may further include other event inputs SAto SAn. The log information LGD is timestamp information of the RTC and may include timestamps of various events in addition to condensation events. For example, it is assumed that the event input terminal TMEVIis connected to the first electrode. In this case, the timestamp information output in response to a transition of the event detection signal SEVis the log information of a condensation event.

133 132 150 160 600 133 150 160 The buffer control circuitrecords the log information LGD from the data capture circuitin the storage circuit. When a read request is issued to the interface circuitfrom an SoC or the like outside the real-time clock device, the buffer control circuitreads the log information LGD from the storage circuit. The interface circuittransmits the read log information LGD to the external SoC or the like.

8 FIG. 8 FIG. 8 FIG. 600 600 50 50 600 illustrates a first structural example of the real-time clock device.is a cross-sectional view when a cross section parallel to the xz plane is viewed in the +y direction. Hereafter, the terminal TM and the in-package wiring are omitted in the illustration. The +z direction may be referred to as up, and the-z direction may be referred to as down. Althoughillustrates an example in which the real-time clock deviceincludes the battery, the batterymay alternatively be disposed outside the real-time clock device.

500 510 520 510 510 510 520 520 510 100 300 50 500 510 100 50 300 100 The packageincludes a basehaving a recess, and a lid, which is the lid of the base. The bottom surface SFa of the baseis parallel to the xy-plane, and the recess of the baseopens upward. The lidcovers the recess such that the edge of the lidis bonded to the edge of the recess of the base, thereby sealing the integrated circuit device, the vibrator, and the batteryinside the package. The recess of the basehas a bottom surface SFf and a stepped surface SFe disposed above the bottom surface SFf. The integrated circuit deviceand the batteryare arranged side by side in the x direction on the bottom surface SFf, and the vibratoris arranged on the stepped surface SFe. The integrated circuit deviceis, for example, a bare chip, and is disposed such that its thickness direction corresponds to the z direction.

100 300 510 100 300 100 300 510 100 300 510 100 50 The integrated circuit deviceand the vibratorare connected to each other by in-package wiring. The in-package wiring includes bonding wires or wiring disposed inside or on the inner surface of the structure of the base. For example, the integrated circuit deviceincludes a pad formed of the uppermost layer metal, and the vibratorincludes a terminal for wiring connection. The pad of the integrated circuit deviceand the terminal of the vibratormay be connected to each other by a bonding wire or may be temporarily connected to each other via the wiring of the base. In the latter case, the pad of the integrated circuit deviceand the terminal of the vibratormay be connected to the wiring of the baseusing a bonding wire or a bump. Similarly, the integrated circuit deviceand the batteryare connected to each other by in-package wiring.

50 100 300 300 100 17 FIG. The batterymay be arranged on top of the integrated circuit device. In addition, as described later with reference toand the like, the vibratormay be disposed on a relay substrate or the like. In this case, the vibratorand the integrated circuit devicemay be arranged so as to overlap each other in plan view along the z direction.

170 176 1 41 176 1 1 1 130 In the present embodiment, the event detection circuitincludes the event trigger circuit. Hereafter, it is assumed, for example, that the event input terminal TMEVIis connected to the first electrode. The event trigger circuitreceives the input signal EVIfrom the event input terminal TMEVIand the other event inputs SAto SAn, and outputs the event trigger signal EVTRG. The processing circuitrecords the timestamp information based on the event trigger signal EVTRG as the log information LGD.

600 40 600 The real-time clock devicehas a function of recording timestamp information when various events occur. In the present embodiment, a liquid wetting event is detected as one of the events. Accordingly, the configuration of the loggercan be simplified by detecting a liquid wetting event using the timestamp function of the real-time clock device.

9 FIG. 4 FIG. 40 40 56 5 56 45 41 42 56 45 40 illustrates a second structural example of the logger. This example is basically the same as the first side view and the second side view of; however, the loggerfurther includes the piece of paper, which is the measurement object. The piece of paperis attached to the substrateso as to be in contact with the first electrodeand the second electrode. The piece of paperis attached to the substrateby, for example, an adhesive tape or an adhesive. In this example, the loggercan be used without being attached to a corrugated fiberboard box or the like.

10 FIG. 3 FIG. 40 600 40 50 600 600 41 42 10 600 5 5 41 42 5 5 5 a a a a. illustrates a third structural example of the logger. In this example, the real-time clock deviceitself is the logger. The batteryis built into the real-time clock device. As described with reference to, a plurality of terminals TM are disposed on the back surface of the real-time clock device. Among them, the event input terminal TMEVI is used as the first electrode, and the ground terminal TMGND is used as the second electrode. As illustrated in the side view of FIG., the real-time clock deviceis attached to the corrugated fiberboardsuch that its back surface is in contact with the corrugated fiberboard. As a result, the event input terminals TMEVI, which are the first electrodes, and the ground terminals TMGND, which are the second electrodes, come into contact with the corrugated fiberboard. The attachment is, for example, achieved by using an adhesive tape or an adhesive. The measurement objectis not limited to the corrugated fiberboard

11 FIG. 4 FIG. 40 40 600 46 47 48 600 600 600 46 46 5 5 41 42 45 47 600 41 46 48 600 42 46 5 5 a a a. illustrates a fourth structural example of the logger. The loggerincludes the real-time clock device, the substrate, a first electric wire, and a second electric wire. The real-time clock devicehas a built-in battery and is not mounted on a substrate. Alternatively, a battery may be disposed outside the real-time clock device, and the real-time clock deviceand the battery may be mounted on a substrate. The substratehas a first surface and a second surface, and the substrateis attached to the corrugated fiberboardsuch that the second surface is in contact with the corrugated fiberboard. On the second surface, the first electrodeand the second electrodeare disposed in the same manner as on the second surface of the substrateillustrated in. One end of the first electric wireis connected to the event input terminal of the real-time clock device, and the other end is connected to the first electrodeof the substrate. One end of the second electric wireis connected to the ground terminal TMGND of the real-time clock device, and the other end is connected to the second electrodeof the substrate. The measurement objectis not limited to the corrugated fiberboard

12 FIG. 11 FIG. 40 600 11 10 46 5 10 5 5 5 10 11 10 c c c illustrates a fifth structural example of the logger. This example is basically the same as the fourth structural example of; however, the real-time clock deviceis mounted on the substrateinside an electronic device. Additionally, the second surface of the substrateis attached to the inner surface of the housingof the electronic device. The measurement objectis the housing, and the housingis, for example, resin or metal coated with an insulating film. Various components, such as an integrated circuit (IC), a resistor, a capacitor, or a connector for implementing the functions of the electronic devicemay be mounted on the substrate. Examples of the electronic devicevary but include a printer, projector, television set, camera, personal computer, display, game console, smartphone, smartwatch, head-mounted display, or audio equipment.

13 FIG. 4 FIG. 13 FIG. 41 42 1 2 2 3 41 1 2 42 1 3 41 42 41 42 depicts a second shape example of the first electrodeand the second electrode. The first shape example is two parallel linear electrodes as illustrated in, for example,. In, any two directions perpendicular to each other are referred to as a first direction DRand a second direction DR. The direction opposite to the second direction DRis referred to as a third direction DR. In the second shape example, the first electrodeincludes a linear portion extending along the first direction DRand a comb-tooth portion protruding in the second direction DRfrom the linear portion. The second electrodeincludes a linear portion along the first direction DRand a comb-tooth portion protruding in the third direction DRfrom the linear portion. The comb-tooth portion of the first electrodeand the comb tooth portion of the second electrodeare disposed so as to mesh with each other. That is, the teeth of the comb-tooth portion of the first electrodeand the teeth of the comb-tooth portion of the second electrodeare alternately arranged along the first direction.

14 FIG. 41 42 41 42 41 42 41 42 depicts a third shape example of the first electrodeand the second electrode. Each of the first electrodeand the second electrodehas a spiral shape. The spiral of the first electrodeand the spiral of the second electrodeare arranged such that the first electrodeand the second electrodeappear alternately on a straight line connecting the center of the spirals and an arbitrary outside point.

15 FIG. 5 FIG. 600 600 200 100 140 is a block diagram illustrating a second circuit configuration example of the real-time clock device. The description of the same portions as those of the first circuit configuration example ofwill be omitted. The real-time clock devicefurther includes a sensor. The integrated circuit devicefurther includes a detection circuit.

200 200 600 600 15 FIG. The sensordetects environmental information and outputs an output signal SQ as the detection result. Specific examples of the sensorwill be described later. Althoughillustrates an example in which the real-time clock deviceincludes one sensor, the real-time clock devicemay include a plurality of sensors.

140 200 140 140 140 140 The detection circuitperforms detection processing on the output signal SQ from the sensorand outputs sensor detection information SSD as the result. The output signal SQ is, for example, a charge, current, voltage, or other analog signal. The sensor detection information SSD may be digital data suitable for handling by a logic circuit in a subsequent stage. The digital data is not limited to multi-bit data and includes binary (1-bit) signals. For example, the detection circuitmay include an analog-to-digital (A/D) conversion circuit. The A/D conversion circuit converts the output signal SQ from analog to digital and outputs the resulting sensor detection information SSD. Alternatively, the detection circuitmay further include an amplifier circuit that amplifies the output signal SQ prior to A/D conversion. If the output signal SQ includes a carrier wave signal and a detection signal, the detection circuitmay further include a demodulator to extract the detection signal from the output signal SQ prior to the A/D conversion circuit. In the case where the sensor detection information SSD is binary output, the detection circuitmay include a comparator that compares the output signal SQ to a reference voltage corresponding to a threshold.

130 130 130 The processing circuitassociates output environmental information, based on the sensor detection information SSD, with the time information TMD, and outputs the resulting information as log information LGD. The output environmental information may be the sensor detection information SSD itself or may be information derived by performing operations on the sensor detection information SSD. These operations may include, for example, addition, subtraction, multiplication, division, differentiation, integration, or statistical processing. The processing circuitmay always output the log information LGD, or may output the output environmental information and the time information TMD as the log information LGD when an event of the environment information is detected. Alternatively, when a condensation event is detected, the processing circuitmay output the condensation event information, the output environmental information, and the time information TMD as the log information LGD.

200 40 200 200 140 16 FIG. A detailed configuration example and an operation example of the case where the sensoris a MEMS acceleration sensor will be described hereafter. In this example, for example, an impact or acceleration applied to a transportation object is detected as the environmental information. That is, the loggerin this example is both a condensation logger and a shock data logger. An example in which the sensoris another sensor will be described later.is a block diagram illustrating a detailed configuration example of the sensorand the detection circuit.

200 211 212 213 200 200 200 200 211 212 213 The sensorincludes an x-axis acceleration sensor element, a y-axis acceleration sensor element, and a z-axis acceleration sensor element. Although the example in which the sensoris a three-axis acceleration sensor is illustrated here, the sensormay be a one-axis or two-axis acceleration sensor. The sensorhas a substantially plate-like shape parallel to the xy-plane. In a specific example, the sensorincludes a support substrate having a bottom surface parallel to the xy-plane and a lid bonded to the support substrate. The x-axis acceleration sensor element, the y-axis acceleration sensor element, and the z-axis acceleration sensor elementare arranged on a support substrate and are covered with the lid.

211 211 140 212 The x-axis acceleration sensor elementincludes a comb-shaped fixed electrode fixed to the support substrate, a movable portion configured to be movable with respect to the support substrate, and a comb-shaped movable electrode fixed to the movable portion. The comb teeth of the fixed electrode and the comb teeth of the movable electrode are arranged to face each other in the x-direction. When acceleration in the x-direction is applied to the x-axis acceleration sensor element, the movable portion moves in the x-direction and the distance between the comb teeth changes, so that the capacitance between the comb teeth changes. By detecting the change in the capacitance, the detection circuitdetects the acceleration in the x-direction as the sensor detection information SSD. The y-axis acceleration sensor elementhas the same configuration.

213 140 The z-axis acceleration sensor elementincludes a comb-shaped fixed electrode fixed to the support substrate, a movable portion capable of swinging about a rotation shaft parallel to the xy-plane, and a comb-shaped movable electrode fixed to the movable portion. The comb teeth of the fixed electrode and the comb teeth of the movable electrode are arranged to face each other in the x-direction or the y-direction. When acceleration in the z-direction is applied, the movable portion swings and the overlapping area between the comb teeth changes, so that the capacitance between the comb teeth changes. By detecting the change in the capacitance, the detection circuitdetects the acceleration in the z-direction as the sensor detection information SSD.

140 141 142 141 142 211 212 213 140 211 212 213 141 The detection circuitincludes an amplifier circuitand an A/D conversion circuit. The amplifier circuitand the A/D conversion circuitmay be provided for each of the x-axis acceleration sensor element, the y-axis acceleration sensor element, and the z-axis acceleration sensor element. Alternatively, the detection circuitmay include a selector, and the selector may select the output signals of the x-axis acceleration sensor element, the y-axis acceleration sensor element, and the z-axis acceleration sensor elementin a time-division manner and output the selected output signals to the amplifier circuit.

140 141 142 211 212 213 The detection circuitincludes the amplifier circuitand the A/D conversion circuit. Here, it is assumed that SQ represents the output signal of the x-axis acceleration sensor element, but the same applies to the output signals of the y-axis acceleration sensor elementand the z-axis acceleration sensor element.

141 211 142 141 The amplifier circuitconverts the output signal SQ of the x-axis acceleration sensor elementfrom a charge (C) signal to a voltage (V) signal (Q/V conversion) and amplifies the voltage signal. The A/D conversion circuitconverts the output signal of the amplifier circuitfrom analog to digital (A/D conversion) and outputs a result of the A/D conversion, which is x-axis acceleration data, as the sensor detection information SSD.

17 18 FIGS.and 17 FIG. 18 FIG. 17 FIG. 600 600 520 500 illustrates the second structural example of the real-time clock device.is a plan view of the real-time clock devicewhen viewed along the −z direction, andis a cross-sectional view taken along line XVIII-XVIII of. Hereafter, the terminal TM and the in-package wiring are omitted in the illustration. Additionally, in the plan view, a lidof the packageis omitted in the illustration. Additionally, the +z direction may be referred to as up, and the-z direction may be referred to as down.

510 100 200 100 200 100 200 300 310 310 300 510 520 510 520 100 200 300 500 310 510 310 300 100 200 100 17 18 FIGS.and The recess of the basehas a bottom surface SFb and a step surface SFc disposed above the bottom surface SFb. The integrated circuit deviceis disposed on the bottom surface SFb, and the sensoris disposed on top of the integrated circuit device. The sensoris, for example, a substantially rectangular parallelepiped. The integrated circuit deviceand the sensorare arranged such that their thickness directions correspond to the z direction. The vibratoris, for example, a quartz crystal vibrator and is formed on a quartz crystal relay substrate. With an end portion of the relay substratebonded to the stepped surface SFc, the vibratoris housed in the base. Then, the lidcovers the recess of the basesuch that the edge of the lidis bonded onto the edge of the recess, thereby sealing the integrated circuit device, the sensor, and the vibratorin the package.illustrate an example in which the relay substrateis disposed in the-x direction with respect to the center of the baseand three sides of the relay substrateare bonded onto the stepped surface SFc. In plan view, the vibratormay overlap the integrated circuit deviceand the sensoror may overlap only the integrated circuit device.

100 200 100 300 8 FIG. The integrated circuit deviceand the sensorare connected to each other by in-package wiring. The integrated circuit deviceand the vibratorare connected to each other by in-package wiring. The in-package wiring is as described with reference to.

200 600 200 The sensorthat detects the environmental information is not limited to the MEMS acceleration sensor described above. The environmental information may be, for example, impact, acceleration, angular velocity, temperature, dew point, humidity, odors, gases, forces, or pressure. The real-time clock devicedetects one or more of these parameters. Examples of the sensorare as follows.

200 200 40 40 40 (1) Acceleration sensor: The sensoris, for example, a capacitive acceleration sensor using silicon MEMS described above. Alternatively, the sensormay be an acceleration sensor using a quartz crystal vibrator, an acceleration sensor using a piezoelectric element, or other type. The loggerequipped with the acceleration sensor can be used as, for example, a shock data logger. That is, by using the acceleration sensor, the loggerdetects and records the impact applied to a device equipped with the loggeras the environmental information.

200 200 100 100 110 200 (2) Temperature sensor: The sensoris, for example, a thermistor, thermocouple, or resistance temperature detector. Alternatively, the sensormay be a temperature sensor that measures temperature using the temperature characteristics of the forward voltage of a p-n junction. Such a temperature sensor may be built in the integrated circuit device. The integrated circuit devicemay include, for example, a temperature sensor and a temperature compensation circuit that performs the temperature compensation of the oscillation frequency of the oscillation circuitbased on a detection signal of the temperature sensor. The temperature sensor used for the temperature compensation may also serve as the sensor.

200 (3) Odor sensor: The sensoris, for example, a gas sensor that senses odors by detecting gases in the air.

200 200 200 (4) Force sensor: The sensoris, for example, a load sensor using a quartz crystal vibrator. The sensorincludes a quartz crystal double-ended tuning fork (DETF) vibrator and a cantilever. When a force is applied to the cantilever, the tension on the quartz crystal DETF vibrator changes. The change in tension causes a shift in the vibration frequency of the quartz crystal DETF vibrator. This frequency shift enables the detection of the applied force. Alternatively, the sensormay be a force or pressure sensor using silicon MEMS technology.

200 300 110 (5) Angular velocity sensor: The sensormay be a gyro sensor using a quartz crystal vibrator or a MEMS vibrator. For example, the quartz crystal vibrator includes driving arms and sensing arms, and a drive circuit drives the driving arms to vibrate the driving arms. When the Coriolis force is generated due to the angular velocity, the vibration states of the sensing arms change. By detecting the changes, the angular velocity can be detected. This quartz crystal vibrator may also serve as the vibratorfor generating the clock signal CK. In this case, the drive circuit that drives the driving arms corresponds to the oscillation circuit.

200 120 The environmental information is detected by using the sensoras described above, and is recorded together with the time information TMD by the clock circuit, enabling an environmental data logger in a physical distribution process to be configured. By recording the time information TMD, for example, the time at which a specific event has occurred can be known later. By collating such log information with information indicating the time at which each stage of the physical distribution is performed, it is possible to estimate at which stage of the physical distribution a specific event has occurred.

10 FIG. 10 FIG. 41 600 42 600 As described with reference to, the first electrodesmay be the event input terminal TMEVI of the real-time clock device. The second electrodemay be a reference voltage terminal of the real-time clock device. In the example of, the reference voltage terminal is the ground terminal TMGND.

600 40 600 40 600 According to the present embodiment, a liquid wetting event can be detected by using the real-time clock deviceitself as the logger. The real-time clock deviceis a very small device sealed in a ceramic package or the like. According to the present embodiment, a very small loggercan be implemented by using the real-time clock devicein such a manner.

10 8 FIGS.and 40 50 500 600 Additionally, as described with reference to, the loggermay include the batteryhoused in the packageof the real-time clock device.

600 50 600 40 According to the present embodiment, the real-time clock devicecan be operated by the built-in battery, enabling the real-time clock deviceitself to be used as the logger.

11 12 FIGS.and 40 46 47 48 41 42 46 47 41 600 48 42 600 Additionally, as described with reference to, the loggermay include the substrate, the first electric wire, and the second electric wire. The first electrodeand the second electrodemay be disposed on the substrate. The first electric wiremay connect the first electrodeto an event input terminal of the real-time clock device. The second electric wiremay connect the second electrodeand the reference voltage terminal of the real-time clock device. The reference voltage terminal is, for example, a ground terminal.

600 41 42 5 600 According to the present embodiment, the real-time clock devicecan be disposed separate from the first electrodeand the second electrodethat are in contact with the measurement object, which is likely to be wetted. Thus, the real-time clock devicecan be protected away from a liquid.

9 FIG. 40 5 Additionally, as described with reference to, the loggermay include the measurement object.

40 5 40 5 According to the present embodiment, since the loggerincludes the measurement objectin advance, the loggercan be used without being attached to the measurement object.

15 18 FIGS.to 40 130 150 Additionally, as described with reference to, the loggermay include an acceleration sensor. The processing circuitmay record impact log information based on acceleration data from the acceleration sensor in the storage circuit.

40 40 According to the present embodiment, in addition to a liquid wetting event, the impact information can be recorded in association with the time information TMD as the log information LGD. By referring to the log information LGD, it is possible to know when an impact is applied to a device equipped with the loggeror when and what kind of impact is applied to the device equipped with the logger.

40 130 150 Additionally, in the present embodiment, the loggermay include a temperature sensor. The processing circuitmay record temperature log information based on temperature detection data from the temperature sensor in the storage circuit.

According to the present embodiment, in addition to a liquid wetting event, the temperature information can be recorded in association with the time information TMD as the log information LGD. By referring to the log information LGD, it is possible to know the environmental temperature at each time, when a change or the like in the environmental temperature has occurred, or the like.

Although the present embodiment is described in detail as described above, those skilled in the art could easily understand that many modifications may be made without substantially departing from new matters and effects of the present disclosure. Therefore, all such modifications are included in the scope of the present disclosure. For example, the terms described together with different terms having a broader meaning or the same meaning at least once in the specification or the drawings may be replaced with the different terms in any portion in the specification or the drawings. In addition, all combinations of the present embodiment and modifications are also included in the scope of the present disclosure. In addition, the configurations, operations, and the like of the clock circuit, the event detection circuit, the storage circuit, the processing circuit, the oscillation circuit, the interface circuit, the detection circuit, the integrated circuit device, the vibrator, the sensor, the package, the real-time clock device, the first electrode, the second electrode, the substrate, the logger, the measurement object, and the like are not limited to those described in the present embodiment, and various modifications can be made.